This game is mega cool!
you can choose a two heros in each mission from 3 heros, X, Axl, Zero each one has a special abilities for example Axl can copy the DNA of the enemy troops to transform himself to that troop you chosen, There is also some missions you can drive some hover cycles, they add a new attack called Double Attack you can do it when your Double Attack bar, this attack will do it the two heros that you chose for example Zero and X, Zero wil strike by sword and X will attack by beam. So enjoy yourself during saving the world from the evil.